Add role to group after purchase

You'd have to write your own code to do this. The function to add a role to a user in a group is:

/**
 * Add role to og_users_roles table.
 *
 * @param $uid the user ID
 * @param $rid the role ID
 * @param $gid node ID of the group for the user in this role
 *
 * There is no return parameter, but "hook_og()" is invoked with args:
 * 'rid' (role ID) and 'ogr_id' (og_users_roles table ID for the newly created record).
 */
function og_user_roles_role_join($uid, $rid, $gid) {

I'm sorry, this is not the entire code. It's the header information for the function which actually adds a ogur role to a user. If you know how to code, you will need to do this:

1. Identify the users in the group for which you wish to add the role. This will be a list of user ids ($uid) who belong to a particular group id ($gid).
2. Identify the role id ($rid) that you wish to add to the group.
3. Create a function which will add the group role to each user in the group. Something like:

// Let's assume that $user_array() is an array of the ids of the users in the group
// This code will add the role $rid to each user $uid in the group $gid
foreach ($user_array as $uid) {
  og_user_roles_role_join($uid, $rid, $gid);
}

You'll need to code this up in a separate custom module designed for this purpose.

I'm sorry. It sounds like I may not fully understand your question.

It sounds like this is the scenario you are describing:

User A is an administrator for Group A. He has the OGUR group role "organization" in Group A. This role allows him to "Configure member roles" in OGUR.

The "quiz" role, by default, is NOT visible to User A when he is in the "Configure member roles" screen.

What you want to happen is for User A to purchase the "quiz" role, so that it will be available in the "Configure member roles" screen and he will be able to assign it to all users in Group A.

Is this correct?

This isn't possible in OGUR today because it is not possible to restrict roles by group. Using the "Configure restricted member roles" feature, you can restrict what roles a particular role can assign, but this would apply to any user in any group, so long as he has this group role.

What you want to do is say that User A with the "organization" role in Group A now can add the "quiz" role to users in Group A.

However, User B with the "organization" role in Group B will also now be able to add the "quiz" role to users in Group B.

What we need to be able to do is to restrict assignment of the "quiz" role to Group A. There is currently no way to do this in OGUR except in the case where Group A and Group B belong to different group content types. Or, if you have a different "organization" role for each Group. But then, this becomes messy and difficult to maintain.

We would need another rule to allow/disallow a particular role from being used in a group. There is no logic for this right now.